I have the coffman pipe, (with flange and good rubber hose)
I have the micro-tech ignition/revlimiter (its 3 months old)
I have the micro-tech single water injection controller
I have a new water injection tip and water flow valve as well.
also the water injection controller valve as well.

I sent you my email in a PM, we can talk thru email. not sure
what items you are wanting?

The Coffman will really wake up your Ski but the 99 will need a remapped MPEM or an add on ignition that will let it rev into the range the pipe makes power and retard the ignition over 7k. OR you can go back to a 98 electrical system and get an adjustable revlimiter